Technics SL-1200MK5 Dream Build! Fully Upgraded Turntable w/New Sumiko

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General:

This SL-1200 was super fun to build.

The goal was to take the SL-1200 to the highest level, while avoiding any gimmicks or snake oil.

I started with what is arguably the best foundation for an SL-1200 - the MK5 Variant - and then performed the following mods:

1. Brand new main board form Technics to ensure long-term reliability
2. Gutted power supply and installed 2 piece unit from LDA
3. Installed a silicone tonearm damper from KAB
4. Installed custom mag levitation feet machined out of aluminum
5. Placed Audio-Technica record weight
6. Installed new Sumiko carbon fiber headshell
7. Installed new Sumiko Songbird high output MC cartridge
8. Eliminated captive RCA cable and installed custom 3D printed RCA jack box underneath.
9. Sourced new Kimber Hero RCA cables with WBT connectors
10. Sourced Audioquest NRG-4 power cable

The result is a highly performing SL-1200 that can rival the modern $10k+ version recently released.

Also includes an acrylic dust cover which is not hinged.

The SkyFi Testing Process for Turntables:

First we try to identify any mechanical issues, particularly in the tonearm bearings. We check for freedom of movement or any resistance on both the horizontal and vertical range. There is a quick test for this which involves placing the table on its front edge and allowing the arm to swing freely like a pendulum. We then make any adjustments necessary to achieve minimal resistance and sometimes adjust the bearing pressure. On gimbal tonearms we inspect the cone tip with a magnifier.

We then asses the platter speed by using one of several methods, the most accuse is a playing a test tone on a test record and measuring the frequency out put with a frequency counter or oscilloscope. We also utilize test equipment to measure the wow and flutter to ensure its within spec. We do this for all speeds available for that particular model. Adjustments are then made to achieve proper speed which will vary depending on table drive design. Some require an adjustment of an internal or external potentiometer, some will require a pulley or motor adjustment. We also inspect the platter bearing to ensure its properly lubricated keeping in mind that some don't require lubrication at all.

We then inspect the power supply and address any issues with overworked capacitors particularly on Linn and later Thorens machines which tend to need attention.

On fully mechanical vintage tables like the Thorens TD124 and Garrard 301/401 we will go thought the entire mechanism, replace any worn parts and lubricate all components necessary to ensure smooth operation, speed change and low mechanical noise.

When fitting a new cartridge we will go through our detailed calibration process which can involve as many as 12 steps depending on the arm design. We perform this work on our custom turntable calibration rig which was developed in-house.

Some of these steps include:

Pivot to spindle adjustment

Tracing force

Anti-skate

Tonearm height

Lifter height

VTA

Azimuth

Stylus Distance and Overhang

We then do a critical listening test using our test records and our test system to ensure proper sonics.